Year | Value | 2022 | 19.674 | 2021 | 20.09 | 2020 | 20.517 | 2019 | 20.956 | 2018 | 21.405 | 2017 | 21.866 | 2016 | 22.339 | 2015 | 22.819 | 2014 | 23.307 | 2013 | 23.801 | 2012 | 24.303 | 2011 | 24.812 | 2010 | 25.328 | 2009 | 25.828 | 2008 | 26.274 | 2007 | 26.727 | 2006 | 27.184 | 2005 | 27.646 | 2004 | 28.113 | 2003 | 28.585 | 2002 | 29.061 | 2001 | 29.542 | 2000 | 30.027 | 1999 | 30.518 | 1998 | 30.936 | 1997 | 31.313 | 1996 | 31.692 | 1995 | 32.074 | 1994 | 32.459 | 1993 | 32.845 | 1992 | 33.234 | 1991 | 33.626 | 1990 | 34.019 | 1989 | 34.415 | 1988 | 35.128 | 1987 | 36.13 | 1986 | 37.143 | 1985 | 38.167 | 1984 | 39.2 | 1983 | 40.264 | 1982 | 41.336 | 1981 | 42.416 | 1980 | 43.502 | 1979 | 44.598 | 1978 | 45.753 | 1977 | 46.961 | 1976 | 48.171 | 1975 | 49.386 | 1974 | 50.6 | 1973 | 51.954 | 1972 | 53.303 | 1971 | 54.651 | 1970 | 55.99 | 1969 | 57.24 | 1968 | 58.412 | 1967 | 59.578 | 1966 | 60.731 | 1965 | 61.873 | 1964 | 63 | 1963 | 64.178 | 1962 | 65.337 | 1961 | 66.478 | 1960 | 67.599 |
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